Joseph herrburger



(No Model.)

J. HERRBURGER.

PIANO ACTION.

Patented Oct. 10, 1893.

Int em):-

UNITED STATES PATENT OFFICE.

JOSEPH HERRBURGER, OF PARIS, FRANCE.

PIANO-ACTION.

SPECIFICATION forming part of Letters Patent No. 506,366, dated October 10, 1893.

Application filed May 31, 1893. Serial No. 476,033. (No model.)

To all whom it may concern.-

Be it known that I, J OSEPH HERRBURGER, a citizen of France, and a resident of Paris, France,have invented certain new and useful Improvements in Piano-Actions, of which the following is a specification.

This invention relates to an improved action for grand pianos and more particularly to means for regulating the spring of the repeating lever, and means for connecting the spring to such lever and means for regulating the inclination of the jack.

In the accompanying drawings: Figure l is a side elevation partly in section of my improved action for grand pianos and Fig. 2am elevation of the pivoted block m.

The letter a, represents the key of a grand piano action. I), is the rocker, c the rider, d, the rider flange, e the jack, fthe repeating lever, g the hammer and h, the interposed repeating finger, if the latter is employed. All these parts are of the ordinary or any suitable construction.

The first part of my invention relates to the construction of the spring 1', for lifting the repeating lever f. This springl make of bent form, connecting one end to the lever f, and the other end to an adjusting screw 70, while at its bend it embraces a pivot d, of the rider flange d. The adjusting screw it, engages at its lower end a tapped opening of the rider 0, while its upper end is headed so as to be readily revoluble by a proper tool. This headed end extends upward between the hammer shanks and may be easily reached, even when the action is set up in theinstrument. Upon the screw shank 70, I secure a button or nut 70, upon which the lower end of the spring 1', bears. It will be seen that by revolving the screw shank it, the tension of the spring 11, may be easily regulated.

The second part of my invention relates to the means for attaching the spring 2', to the repeating leverf. Within a slot of such lever is hung upon pivot m, a freely vibrating block m. This block is slotted at its lower end, the slot being bridged by a cord or noiseless pin m around which the upper end of spring 2', is bent. Owing to the centering of the block m, any friction of the spring at its working end is avoided and consequently all danger of producing a squeaking noise is averted. For regulating the slant of the jack, I may provide it below the rider 0, with a slotted extension 6. Through this slotted extension there extends a screw it, engaging a tapped opening ofa block 0, depending downwardly from the rider 0. Between the head n, of screw it, and the extension 6, a cushion or washer p, is interposed. The jack spring q, will hold the extension 6, permanently in contact with the washer. When the screw n, is revolved, the slant of the jack is at once changed, as will be readily understood.

What I claim is- 1. The combination of a repeating lever, rider and rider flange, with a screw shank engaging the rider and with a bent spring which is pivoted to the rider flange and engages the repeating lever and the screw shank, substantially as specified.

2. The combination of a repeating lever with a block pivoted thereto and with a lever spring engaging such pivoted block, substantially as specified.

Signed at Paris, France, this 8th day of May, A. D. 1893.

JOSEPH HERRBURGER.

Witnesses:

J. MIGNAL, A. WEYL. 

